Question:
If one is in the middle of pesukei di’zimrah or birchos kerias shema and one feels tired and is falling asleep, is it permissible to stop and have a cup of coffee to help one stay awake?
Answer:
This is something that should be taken care of before we start davening, (during davening is not the time for coffee), however if it is indeed needed for you to daven, it is permitted during Pesukei D’zimra (between prakim of BIrkas Kriyas Shema is controversial). But again only is indeed there is a need.
Best Wishes
Sources:
Regarding talking out if the is need for the davening see Igros Moshe O:CH 1-22, Pri Hadadeh 2-15, Horav Y. Cahen shlit”a
